WO2008044902A1 - Procédé de relais pour stations relais (rs) reposant sur l'utilisation d'une zone de relais direct dans un système de relais multi-saut - Google Patents

Procédé de relais pour stations relais (rs) reposant sur l'utilisation d'une zone de relais direct dans un système de relais multi-saut Download PDF

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Publication number
WO2008044902A1
WO2008044902A1 PCT/KR2007/005016 KR2007005016W WO2008044902A1 WO 2008044902 A1 WO2008044902 A1 WO 2008044902A1 KR 2007005016 W KR2007005016 W KR 2007005016W WO 2008044902 A1 WO2008044902 A1 WO 2008044902A1
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Prior art keywords
zone
direct
relay
frame
base station
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PCT/KR2007/005016
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English (en)
Inventor
Su-Chang Chae
Young-Il Kim
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Electronics and Telecommunications Research Institute ETRI
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Electronics and Telecommunications Research Institute ETRI
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Priority to US12/445,436 priority Critical patent/US20100008284A1/en
Publication of WO2008044902A1 publication Critical patent/WO2008044902A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels

Definitions

  • the present invention relates to a multi-hop relay system, and more particularly, t o a method of relaying a data burst in a relay station, which demodulates a received sig nal without decoding, and then modulates and transmits the demodulated signal within a single frame, and a system using the method.
  • This work was supported by the IT R&D program of MIC/IITA[2006-S-011-01 , De velopment of relay/mesh communication system for multi-hop WiBro].
  • the Institute of Electrical and Electronics Engineers (IEEE) 802.16e working gro up is in the process of standardizing mobile multi-hop relay (MMR), and is actively participating in research into frame structures.
  • MMR mobile multi-hop relay
  • a relay station (R S) newly introduced between a base station (BS) and a mobile station (MS) of a conven tional wireless broadband (WiBro) system transmits a signal between the BS and the M S.
  • the MMR network has a BS-to-RS link and an RS-to-MS link.
  • the WG aims to pr ovide a simpler and cheaper RS than a BS, expand the cell radius of an MS, and impro ve the service transmission speed of the MS in a shadow region.
  • the RS in t he conventional WiBro system cannot completely remove noise by using noise removal means. Accordingly, the RS in the conventional WiBro system is considered as a rep eater.
  • Korean Patent Publication No. 2003-0055915 discloses an RS using an int erference cancellation system (ICS).
  • ICS int erference cancellation system
  • a signal may be fed back from the transmitting antenna and received through the receiving ante nna.
  • a correction device is located between the transmitting and receiving anten nas to offset the fed-back signal by a signal having a magnitude equal to and a phase o pposite to those of the fed-back signal, thereby avoiding interference.
  • the RS using th e ICS can prevent amplification of noise, but cannot correct noise in an input signal. T hat is, errors included in the input signal accumulate as channel noise in the RS.
  • FIG. 1 illustrates a frame structure used in a multi-hop relay (MMR) system accor ding to an embodiment of the present invention.
  • MMR multi-hop relay
  • FIG. 2A illustrates a symmetric complex frame structure used by a relay station ( RS) of an MMR system according to an embodiment of the present invention.
  • FIG. 2B illustrates a frame structure used by an RS of an MMR system according to another embodiment of the present invention.
  • FIG. 2C is a flowchart illustrating a method of using a direct relay zone of the fra me structure of FIG. 2B.
  • FIG. 3 illustrates an application example of an RS using a symmetric complex fra me structure according to an embodiment of the present invention.
  • FIG. 4 illustrates an apparatus for generating a baseband signal in an RS accord ing to an embodiment of the present invention.
  • FIG. 5 illustrates a method of generating a signal in an RS using a demodulation and forwarding scheme according to an embodiment of the present invention.
  • FIG. 6 illustrates channel coding parameters supporting a non-hybrid automatic r epeat request (HARQ) of a conventional wireless broadband (W ⁇ Bro) system.
  • HARQ non-hybrid automatic r epeat request
  • FIGS. 7A and 7B illustrate extended channel coding parameters according to an embodiment of the present invention.
  • FIG. 8 illustrates a slot concatenation rule according to the extended channel co ding parameters of FIGS. 7A and 7B.
  • FIG. 9 illustrates parameters according to a slot concatenation rule.
  • the present invention provides a method of relaying a data burst in a relay statio n (RS), which can reduce relay latency and efficiently use resources by demodulating a received data burst by using a direct relay zone without decoding, and then modulating and transmitting the demodulated data burst within one frame, and a system and a fram e structure using the method.
  • RS relay statio n
  • a method of rel aying a data burst in a relay station of a multi-hop relay system comprising a base statio n, the relay station, and a mobile station, the method comprising: requesting the base st ation to assign a direct relay zone in a frame in which a demodulation and forwarding sc heme that demodulates, and then modulates and transmits a data burst is applied; and receiving an acknowledgement to the request from the base station.
  • a multi-ho p relay system comprising a relay system relaying a data burst between a base station and a mobile station, wherein the relay station requests the base station to assign a dir ect relay zone in a frame using a demodulation and forwarding scheme, which demodul ates, and then modulates and transmits a data burst, and receives an acknowledgemen t to the request from the base station.
  • a comput er-readable recording medium having embodied thereon a program for executing a met hod of relaying a data burst in a relay station of a multi-hop relay system comprising a b ase station, the relay station, and a mobile station, wherein the method comprises: requ esting the base station to assign a direct relay zone in a frame in which a demodulation and forwarding scheme that demodulates, and then modulates and transmits a data bur st is applied; and receiving an acknowledgement to the request from the base station.
  • a comput er-readable recording medium having embodied thereon a frame structure of a relay sta tion comprising a downlink sub-frame and an uplink sub-frame in a multi-hop relay syst em comprising a base station, the relay station, and a mobile station, wherein the frame structure of the relay station comprises: a first direct relay zone located in the downlink sub-frame and using a demodulation and forwarding scheme that demodulates, and th en modulates and transmits a data burst; and a second direct relay zone located in the uplink sub-frame and using the demodulation and forwarding scheme.
  • a relay station demodulates a rec eived signal without decoding, and then directly modulates and transmits the demodulat ed signal within one frame, relay latency can be prevented and resources can be mana ged efficiently.
  • a method of rel aying a data burst in a relay station of a multi-hop relay system comprising a base statio n, the relay station, and a mobile station, the method comprising: requesting the base st ation to assign a direct relay zone in a frame using a demodulation and forwarding sche me that demodulates, and then modulates and transmits a data burst; and receiving an acknowledgement to the request from the base station.
  • a multi-ho p relay system comprising a relay system relaying a data burst between a base station and a mobile station, wherein the relay station requests the base station to assign a dir ect relay zone in a frame using a demodulation and forwarding scheme, which demodul ates, and then modulates and transmits a data burst, and receives an acknowledgemen t to the request from the base station.
  • a comput er-readable recording medium having embodied thereon a program for executing a met hod of relaying a data burst in a relay station of a multi-hop relay system comprising a b ase station, the relay station, and a mobile station, wherein the method comprises: requ esting the base station to assign a direct relay zone in a frame by using a demodulation and forwarding scheme that demodulates, and then modulates and transmits a data b urst; and receiving an acknowledgement to the request from the base station.
  • a comput er-readable recording medium having embodied thereon a frame structure of a relay sta tion comprising a downlink sub-frame and an uplink sub-frame in a multi-hop relay syst em comprising a base station, the relay station, and a mobile station, wherein the frame structure of the relay station comprises: a first direct relay zone located in the downlink sub-frame and using a demodulation and forwarding scheme that demodulates, and th en modulates and transmits a data burst; and a second direct relay zone located in the uplink sub-frame and using the demodulation and forwarding scheme.
  • FIG. 1 illustrates a frame structure used in a multi-hop relay (MMR) system.
  • a frame 100 is divided by time division duplex (TDD) into a downlink (DL) sub-frame 110 and an uplink (UL) sub-frame 120 on a time axis, and comprises 1024 carriers defined by orthogonal frequency multiple access (OF DMA) on a frequency axis.
  • OF DMA orthogonal frequency multiple access
  • 48 carriers constitute a sub-channel which forms one time slot. Accordingly, one frame consists of 16 sub-channels.
  • the DL sub-frame 110 in which data is transmitted from a base station (BS) to a mobile station (MS) includes a preamble 112, an MAP 114, and a broadcast data and u ser data zone 116, and is 27 symbols long.
  • the UL sub-frame 120 in which data is tra nsmitted from the MS to the BS includes a control channel 122 and a user data zone 12 4, and is 15 symbols long.
  • the MS of a physical (PHY) layer receiving a frame from the BS demodulates an d decodes user data existing in the DL sub-frame, and transmits user data having a len gth that is shorter than a predetermined limit to a media access control (MAC) layer with in a current frame time and user data having a length that is greater than the predetermi ned limit to the MAC layer after one frame time.
  • MAC media access control
  • the MS of the P HY layer encodes and modulates the prepared data and then transmits the encoded an d modulated data to the BS.
  • a relay station (RS) relaying a signal between the BS and the MS in the MMR sy stem regenerates a signal received from the BS and sends the regenerated signal to th e MS in downlink transmission, and regenerates a signal received from the MS and sen ds the regenerated signal to the BS in uplink transmission.
  • RS relay station
  • a wireless broadband (WiBro) system adopts a TDD communication sche me
  • one RS is added between the BS and the MS
  • one downlink is divided into tw o downlinks. That is, a downlink is divided into BS-to-RS and RS-to-MS links.
  • a downlink is divided into BS-to-RS and RS-to-MS links.
  • cou rse there is also a link between the BS and the MS without passing through the RS, tha t is, a BS-to-MS link.
  • the MMR system has a topology including at least three Ii nks.
  • the domai n occupied by each of the three links in one frame is divided on a time axis.
  • the number of hops is 2
  • the number of hops is 3. Accordingly, when multiple hops are for med by adding several RSs, communication can be made with an MS beyond the cell r adius of the BS by extending coverage.
  • time division of one frame accor ding to the number of hops has a disadvantage in that, since timedomain should be add ed to the frame as the number of hops increases, resources allocated in each timedom ain are reduced.
  • time division of one frame according to the number of h ops has an advantage in that frame latency does not occur as the number of hops " mere ases.
  • FIG. 2A illustrates a symmetric complex frame structure used by an RS of an M MR system according to an embodiment of the present invention.
  • a time domain occupied by three links, that is, BS-to-RS, R S-to MS, and BS-to-MS links, of the MMR system in a frame is divided in downlink trans mission.
  • gap zones 2 02 and 224 are needed in a downlink sub-frame.
  • the gap zones 202 and 224 may be used only for the BS-to-MS link.
  • the gap zones 202 and 224 are reduced to 2 symbols, resources allocated to the BS-to-RS link and RS-to-MS link can be increased and an overall throughput can be enhanced, which will be explained later in detail with reference to FIG. 4.
  • a received signal is demodulated for every symbol.
  • demodulation latency corresponds to one symbol .
  • Demodulated data is input to a channel decoder. Since channel decoding is perfor med for every user data burst, channel decoding latency may be several symbols. He nee, gap zones are proportional to the number of bursts processed by the RS. Accordi ngly, each GAP zone is at least 1 symbol long, and is increased and defined by each sy mbol. Accordingly, the BS-to-RS zone 200 of the frame of FIG.
  • an RS-to-MS zone 204 is divided into a dir ection zone 226 and a normal zone 228 in a symmetric manner with respect to the BS-t o-RS zone 200.
  • the frame also includes the gap zone 224 between the BS-to-RS zon e 200 and the RS-to-MS zone 204.
  • an MS-to-RS zone 210 of an uplink sub- frame is divided into a normal zone 230 and a direct zone 232
  • an RS-to-BS zone 2 14 of the uplink sub-frame is divided into a direct zone 236 and a normal zone 238.
  • a gap zone 234 is located between the MS-to-RS zone 210 and an RS-to-MS zone.
  • the present embodiment demodulates a signal without channel decoding, and th en modulates and generates a signal.
  • Bursts in the normal zone 220 of the BS-to-RS zone 200 and the normal zone 230 of the MS-to-RS zone 210 are allocated to the normal zone 228 of the RS-to-MS zone 204 and the normal zon e 238 of the RS-to-BS zone 214, which are farther away from the gap zone 224, and bu rsts in the direct zone 222 of the BS-to-RS zone 200 and the direct zone 232 of the MS- to-RS zone 210, which are only demodulated and modulated, are allocated to the direct zone 226 of the RS-to-MS zone 204 and the direct zone 236 of the RS-to-BS zone 21
  • the bursts which are only demod ulated are first modulated and transmitted through a demodulation and forwarding sche me, and then the decoded bursts are encoded, modulated, and transmitted through a d ecoding and forwarding scheme.
  • T hOp denotes the number of hops and is equal to or greater than 2
  • C denotes a maximum transmission capacity when there is no RS
  • the gap zone 224 required due to modem latency in the RS is locat ed between the BS-to-RS zone 200 and the RS-to-MS zone 204, only a capacity increa ses as the modulation order m r increases, and resources of the BS-to-MS link are alloc ated in the gap zone 224.
  • the throughput enhancement CTH incr eases by as much as 30 % with respect to the maximum transmission capacity C. In t he case of 3 hops, an increase in the throughput is little.
  • the t hroughput enhancement CTH is rendered as
  • FIG. 2B illustrates a frame structure used by an RS of an MMR system according to another embodiment of the present invention.
  • a frame is divided into a downlink (DL) sub-frame and an u plink (UL) sub-frame.
  • the DL sub-frame includes an access zone 240 in which a BS tr ansmits data to an RS or an MS, and an optional transparent zone 242 in which the RS transmits data to its subordinate RS or MS.
  • the UL sub-frame includes a UL access z one 245 and a UL relay zone 247.
  • Each of the UL and DL sub-frames includes a direct relay zone in which a receiv ed data burst is demodulated without decoding or encoding, and then modulated and tr ansmitted.
  • the direct relay zone in each of the UL and DL sub-frames comprises dire ct receiving zones 241 and 246, direct transmitting zones 243 and 248, and gap zones 244 and 249 located between the direct receiving zones and the direct transmitting zon es.
  • the direct receiving zone 241 of the DL sub-frame is located in the access zone 2 40, and the direct transmitting zone 243 of the DL sub-frame is located in the optional tr ansparent zone 242.
  • the direct receiving zone 246 of the UL sub-frame is located in t he UL access zone 245 and the direct transmitting zone 248 of the UL sub-frame is loc ated in the UL relay zone 247.
  • the RS receiving a frame from the BS or its superordinate RS dem odulates a data burst of the direct receiving zone 241 of the DL sub-frame of the frame without decoding, modulates the demodulated data burst, allocates the modulated data burst to the direct transmitting zone 243 of the optional transparent zone 242, and trans mits the allocated data burst to the MS or its subordinate RS.
  • the RS receivi ng a frame from the MS or its subordinate RS demodulates a data burst of the direct re DCving zone 246 of the UL sub-frame of the frame without decoding, modulates the de modulated data burst, allocates the modulated data burst to the direct transmitting zone
  • the RS uses a demodulation and forwarding scheme that demodu lates a signal of a direct relay zone without decoding, modulates the demodulated signa I, and transmits the modulated signal.
  • a direct relay zone of a frame In order to define a direct relay zone of a frame according to the present embodi ment, information regarding: (a) a symbol offset for a position where a direct relay zone of the DL sub-frame starts, (b) a symbol offset for a position where a direct relay zone o f the UL sub-frame starts, (c) the number of OFDMA symbols of the direct relay zone of the DL sub-frame, and (d) the number of OFDMA symbols of the direct relay zone of th e UL sub-frame, is necessary.
  • Such information is one example of what is necessary f or defining the direct relay zone in the frame. There are many other methods of defini ng the direct relay zone shown in FIG. 2B, and various modifications can also be made.
  • FIG. 2C is a flowchart illustrating a method of using a direct relay zone of FIG. 2 B.
  • a BS 250 may optionally assign a direct relay zone aforem entioned with reference to FIG. 2B, to an RS 252.
  • the RS 252 can relay data within one frame by using a demodulation and forwarding schem e.
  • the RS 252 demodulates and deinterl eaves a received burst without decoding, and then interleaves, modulates, and transmit s the burst.
  • the (de)interleaving may be selectively included.
  • the RS sends a direct relay request message to the BS 250.
  • the RS 252 requests the BS 25 to acknowle dge the request using the frame structure of FIG. 2B.
  • the BS 250 s ends a direct relay response message indicating acknowledgement to the direct relay re quest to the RS 252.
  • the direct relay request message include an SBC-R EQ message including a type-length-value (TLV) for the direct relay zone, and example s of the direct relay assignment request response message include an SBC-RSP mess age.
  • TLV included in the SBC-REQ message and the SBC-RSP message is used to indicate a capability of the demodulation and forwarding scheme using the direct rel ay zone.
  • the RS 252 when the RS 252 sends a direct relay request message includi ng a TLV, indicating a request to use the direct relay zone, to the BS 250, the BS 250 s ends a direct relay response message including a TLV, indicating acknowledgement to t he direct relay request to the RS. For example, when a TLV field is 1 , it is an indicatio n that the RS 252 can use the demodulation and forwarding scheme using the direct rel ay zone.
  • the RS 252 receives the direct relay response message indicating acknowle dgement to the direct relay request and relays data using the frame including the direct relay zone.
  • the direct relay zone of the frame is configured using a frame configuration desc ription message including information regarding the arrangement of the direct relay zon e in the frame.
  • the BS 250 broadcasts the frame configuration des cription message.
  • the frame configuration description message can be broadcast at a ny time before the RS 250 directly relays data.
  • the frame configuration d escription message may be received when a network is configured, at a predetermined interval, or while the direct relay response message is sent.
  • One example of the frame configuration description message may be an RS-configuration description (CD) mess age defined in IEEE 802.16j.
  • Examples of information included in the frame configuration description message for describing the arrangement of the direct relay zone in the frame include:
  • a forward error correction (FEC) block size of a data burst in a relay link be tween the BS and the RS should be the same as that of a data burst of an access link b etween the RS and the MS.
  • FEC forward error correction
  • FIG. 3 is an application example of an RS using a symmetric complex frame stru cture according to an embodiment of the present invention.
  • a BS 300 can communicate with MSs 332 and 334 inside a WiBro cell and with an MS 325 outside the WiBro cell through an RS 320.
  • the basic p urpose of an RS in an MMR system is to extend a cell radius and increase data transfer rates with MSs within the cell radius.
  • the RS 320 uses a decoding and forwarding scheme or a demodulation and for warding scheme to regenerate a modem signal.
  • the RS 320 demodulates and decodes received data and corrects errors, and then re-encodes, modulates, and transmits the data to the MS.
  • the RS In the demodulation and for warding scheme, the RS only demodulates received data, and then modulates and tran smits the data to the MS.
  • the decoding and forwarding scheme can be used in a poor environment where the MS 325 exists outside a cell area 340 of the BS 300 and a channel state is poor, wh ereas the demodulation and forwarding scheme can be used when the received and tra nsmitted signal strength of the RS 320 is sufficiently higher than that of the MS 332 and a channel state is good.
  • the MS 334 and the B S 300 directly communicate with each other without the RS because a channel state is very good.
  • FIG. 4 illustrates an apparatus for generating a baseband signal in an RS accord ing to an embodiment of the present invention.
  • an MMR system includes a BS 400, an RS 410, and an MS 420.
  • the BS 400 includes a low MAC, an encoder, and a demodulator.
  • the RS 410 includes a demodulator, a decoder, a low MAC, an encoder, and a modulator.
  • the M S 420 includes a low MAC, a decoder, and a modulator. Since the encoders, decoder s, modulators, and demodulators are well known in this field, a detailed explanation ther eof will not be given here.
  • the RS 410 decodes a signal, and then re -encodes, modulates, and transmits the signal to the MS 420. Accordingly, since laten cy may be lengthened in the RS, data bursts using the decoding and forwarding schem e are allocated to normal zones 220, 228, 230, and 238 of a frame as shown in FIG. 2A . On the other hand, data bursts using a demodulation and forwarding scheme, which only demodulates a signal, and then directly modulates and transmits the signal to the MS 420, are allocated to direct zones 222, 226, 232, and 236 of the frame. Demodula tion and modulation latency corresponds to one symbol.
  • a ti me taken to demodulate and then modulate one symbol is equal to a time taken to perf orm FFT, demapping and mapping, and IFFT, also is equal to a sum of 1/3 of a symbol time, 1/3 of a symbol time, and 1/3 of a symbol time, and also is equal to a 1 symbol tim e.
  • each of gap zones 22 4 and 234 of the frame as shown in FIG. 2A can be reduced to 1 symbol.
  • a time taken to perform each of the (de)mapping and IFFT/FFT can be reduced to 1/3 of a symbol ti me by increasing a reference clock speed three times or more.
  • the decoding and forwarding scheme channel decodes and encodes, and then modulates and transmits a signal to the MS, and the demodulation and forwarding sche me maintains a code rate and changes only a modulation method to regenerate a signa I, thereby reducing the size of resources allocated to the regenerated signal.
  • FIG. 5 illustrates a method of generating a signal in an RS using a demodulation and forwarding scheme according to an embodiment of the present invention.
  • a communication channel between a BS 500 and an RS 502 has a better state than a communication channel between the RS 502 and an MS 504.
  • Data is transmitted using QPSK to a BS-to-RS link and data is transmitted using 16 Q AM to an RS-to-MS link.
  • the MS 504 receiving the 24 sy mbols demodulates the symbols using 16 QAM to obtain the original 96 bits, decodes t he 96 bits again, corrects error, and obtains 48-bit data. At this time, a code rate for th e 48 information bits should not be changed and only a modulation order should be cha nged.
  • channel coding parameters according to the present embodiment ar e defined so that the same code rate can be used for information bits although modulati on orders are different in order to use the demodulation and forwarding scheme. That is, channel coding parameters supporting a non-hybrid automatic repeat request (HAR Q) of a conventional WiBro system are shown in FIG. 6.
  • HAR Q non-hybrid automatic repeat request
  • FIG. 6 when a code rate f or 36-bytes is 1/2, only a modulation order can be changed from QPSK 601 to 16 QAM 602, and also from 16 QAM 602 to 64 QAM 603. In this case, the number of symbols t ransmitted from the RS 502 to the MS 504 of FIG. 5 is reduced to 1/3. QPSK can be d irectly changed to 64 QAM.
  • FIG. 6 illustrates channel coding parameters supporting non-HARQ of a conventi onal WiBro system.
  • the parameters shown in FIG. 6 are used in the RS-to-MS link. However, in FIG. 6, some parameters are defined in the case of a modulation order but are not defined in the case of another modulation order. Accor dingly, when the undefined parameters are additionally defined in the BS-to-RS link, the parameters defined in the conventional WiBro standard of FIG. 6 can be used as they are.
  • parameters exist i n the case of a modulation order QPSK, but do not exist in the case of 16 QAM and 64 QAM.
  • parameters for 12-byte data are defined in the case of 64 QAM, but are n ot defined in the case of 16 QAM. Accordingly, the undefined parameters may be addi tionally defined to be applied to the BS-to-RS link.
  • FIGS. 7A and 7B illustrate extended channel coding parameters according to an embodiment of the present invention.
  • the extended channel coding parameters include parameters added to the parameters defined in the conventional WiBro standard of FIG . 6 such that the extended channel coding parameters can be applied to BS-to-RS and RS-to-BS links.
  • the extended channel coding parameters include all code block sizes for code rates of 1/2, 3/4, and 2/3 respectively in the case of modulation orders QPSK, 16 QAM, and 64 QAM.
  • underlined parameters are the newly add ed parameters.
  • a signal is generated by changing a modulation order and a code rate.
  • the BS should satisfy the following slot boundary condition so as to change only a modulation order and generate a signal.
  • n A denotes the number of slots allocated in a UL access zone
  • ns denotes the nu mber of slots allocated in a UL relay zone
  • the extended channel coding parameters also include all parameters related to a channel encoding method. For example, parameters required by a convolution turb o code (CTC) interleaver are varied according to code block sizes.
  • CTC convolution turb o code
  • the extended chan nel coding parameters according to the present embodiments also include parameters not only in a non-HARA mode but also in a HARQ mode.
  • FIG. 8 illustrates a slot concatenation rule according to the extended channel co ding parameters of FIGS. 7A and 7B.
  • FIG. 9 illustrates parameters according to a slot concatenation rule.
  • the present invention may be embodied as computer readable codes on a comp uter readable recording medium.
  • the computer readable recording medium is any dat a storage device that can store data which can be thereafter read by a computer syste m. Examples of the computer readable recording medium include read-only memories (ROMs), random-access memories (RAMs), CD-ROMs, magnetic tapes, floppy disks, and optical data storage devices.
  • ROMs read-only memories
  • RAMs random-access memories
  • CD-ROMs compact discs
  • magnetic tapes magnetic tapes
  • floppy disks and optical data storage devices.
  • the computer readable recording medium can be di spersively installed in a computer system connected to a network, and stored and exec uted as a computer readable code in a distributed computing environment.

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Abstract

Procédé de relais de salve de données dans une station relais (RS) de système relais multi-saut (MMR) reposant sur l'utilisation d'une zone de relais direct, et système mettant en oeuvre le procédé. LA RS demande à une station de base d'assigner la zone de relais direct dans une trame à l'intérieur de laquelle on applique un schéma de démodulation et de retransmission qui démodule, puis module et transmet une salve de données, et la RS reçoit un accusé de réception à la demande depuis la station de base et assure le relais d'une salve de données en utilisant la trame à l'intéeieur de laquelle la zone de relais direct est assignée. Etant donné qu'il est possible d'assurer le relais d'une salve de données dans une trame, on peut réduire la latence de relais.
PCT/KR2007/005016 2006-10-13 2007-10-12 Procédé de relais pour stations relais (rs) reposant sur l'utilisation d'une zone de relais direct dans un système de relais multi-saut Ceased WO2008044902A1 (fr)

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US12/445,436 US20100008284A1 (en) 2006-10-13 2007-10-12 Relaying method of relay station(rs) using a direct relaying zone in multihop relay system

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KR20060099946 2006-10-13
KR10-2006-0099946 2006-10-13
KR10-2007-0091152 2007-09-07
KR20070091152 2007-09-07

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